I'm using The Energy Detective (http://www.theenergydetective.com/index.html) and a custom version of this python script (http://svn.navi.cx/misc/trunk/python/ted.py) to measure, track, and graph whole house power consumption.
Apple's Airport line supports IPv6 and 6to4 for those on IPv4.
netbuzz writes "Early adopters of Microsoft Vista are reporting problems with its implementation of IPv6, according to Network World. Example: "We are seeing a number of applications that are IP-based that do not like the addressing scheme of IPv6," says one user. "We will send a print job to an IP-based printer, and the print job becomes corrupted. We're seeing this with Window's Vista machines. When IPv6 is installed, this happens without fail. As soon as we remove IPv6, all of our printer functions return to normal."